Combination pressure and vacuum valve



Patented Nov.- 3, 1925.

UNITED lsTA'rlSs Prrlazla'rl oFFlcE.

Roianm' J. noAUsLAND, or OKLAHOMA crr'z,d oxmom COMBINATION PRESSUREv-`AND VACUUM VALVE.

Arpication filed February 19, 1923. Serial No. 619,929.

To all, whom #may concern.:

-Be it known that I, ROBERT J. MoAUs- LAND, a citizen of the UnitedStates, residing at Oklahoma City, in the county of Oklahoma and Stateof Oklahoma, have invented a certain new and useful Improvement inCombination vPressureJ and Vacuum Valves,

of which the following is a specication, reference being hadto theaccompanying drawings.

`My invention lrelates to improvements in combination pressure andvacuum valves for preventing fluids from escaping from tanks gas, andautomatically permit the entrance.

of air into the tank.

The object of the invention is to provide a device of this characterwhich will be simple 'and inexpensive of construction, which may bequickly and easily applied and removed, which lwill automatically shiftfrom a pressure to afvacuum valve, have freeness and looseness oi valveaction so as not to become fastened, and which will be exceedinglyeiective in accomplishing its intended purpose.

With the above and other objects in view my invention further consistsin the novel features of construction and combination and arrangement ofparts hereinafter def@ scribedv and claimed, and illustrated inthe onesheet accompanying drawings, in which, I Figure 1 is,a one-halfsectional view of a prtion of Fig. 2 on a line shown Atrom A to v fFigure 2 is a section view of the com bined pressure andl vacuum valve.

Figure 3 is a reduced section view vof a portion of Fig. 2` showing anadditional method of using the weights when desired.

Figure 4 is a reduced section` view show-v ing a part of the top portionof Fig. 2 and the connection forjsaving as. j Like characters, of reerence designate like parts in all figures..

' As stated the lnvention relates to improvements 1n combinationpressure and vacuum valves, and consists of a casing 3 of any suitablemetal, preferably" cylindrical having a helically threaded opening 4 inthe bottom into which fits a pipe 1, 2, helically threaded.

This pipe is adapted to, connect the device with the top of `a suitablereceptacle (not shown) adapted to contain volatile liquid.

The outer casing above ,the shoulder hereinbelow further described hasan opening 7 ora pluralitythereof, extending downwardly and outwardly,covered by a hinged closure 7a. The opening, or a plurality thereof,must be of as great capacity as the intake pipe l so as to insure thecarrying off of any overflow from the tank or receptacle, when required.The cylindrical wall ofthe casing has a helically threaded opening atapointbelowr the shoulder adapted for connection with a suitablemanometer,

not shown, which when not so connected is' closed by a similarlythreaded plug 5 with square-headed outer portion for tightening l andloosening. v

A removable cap 39 on the top of the'device and downwardly liared edges40, 41, protect it from the elements, dirt and weather and securelyholds the screen 35 in place,

and is fastened to the flange 8 by screwthreaded bolts 42 and 43 inholes in the standards 36, 37. It has also the member.

38 intended to prevent the pressure valve from injuring the screen 35 bypushing it entirely out.

The casing near 1ts central portion has an inwardly extending radialshoulder, the perpendicular inside edge of the ring of which ishelically threaded as at 6 to t a similarly threaded part of a gasketforming a seatcarrying portion for' the pressure valve and consisting ofthe members 13, 17, 21, 22, 23, and 24 with openings 14, l5, 16 topermit the escape of gas from the tank `when the pressure is too great.On said seat-carrying portionin the upper part of the inside of saiddevice normally rests the pressure valve, with wing-shaped lobes 18, 19,20f-to more easily screw the seats 27 and 28 into place and guide thevalve which includes the members 18, 19, 20, 25, 26, 27, 28 31 and 34back to normal position after being tilted or lifted for escape of gasor fluids, and allow free passage of gas through the channels and yetprevent binding to the sides in closing. The gaskets or seats 27 .and 28may be made of lead, bronze, rubber, libre or other suitable material.

In the pressure valve the top 34 is rounded to prevent contact with themember 38 thereabove from breaking or injuring the screen 35. The leadweights 32, 33 are curved or shaped to permit of easy movement and freereturn to its usual position. It will be observed guides 25, 26, do noteX- tend to the inside of the outer casing but permit of the easymovement and ret-urn to place of the valve .and also the escape of gasesbetween them and the 'outer walls of 9, 10, 11 #and 11a formed as shownon a line A-A. At 11 is shown a screen held in' place by screw bolts 11connecting the 'two semi-circular portions and allowing thc free ingressof air from outside the device. In-l side said last described portion isa cylindricallyshaped seat 52 the outer edge of which is helicallythreaded to fit a similarly threaded surface in the upper portion ofsaid last described semi-circular formation. On top of said seat 52 is avacuum valve with wing-shaped lobes 44, 45, 46 on its lower side, andwing-shaped lobes 49, 50, 51 `on its upper side and a gasket of fibre 47or other suitable material and a metal portion 48 between said upper andlower wingy shaped lobes. v

At 53, 54, 55 is shown a modified form of the application of a weightwhen desired.

At 56, 57,58 is shown a modified form of a top for the device.

When the pressure of the gases arising from the fluid in the tank isgreater than should be allowed the gases ascend1 upwardly from thepassage 1 and varise on the outer surface of the member 9 up to andthrough the holes 14, 15, 16 etc. land afrainst the lower portion of thepressure va ve in the upper part of the device, and when suiiicientlystrong, either raise bodily or tilt one or the other side of saidpressure valve, thereby permitting theescape of ysaid gases thro-ugh theaperture under the seats 27 and 28 as shown by the arrows 29, 30, and-on through the screen 35, into the open air at the top of the device.

As soon as the gases have escaped suiiciently to relieve the danger fromthe tank the .weight of the pressure valve and its weights 32 and 33,causethe pressure valve to resume its former seat, thereby shutting ofany further escapeof the gas until recurrence of similar conditions.

If the withdrawal of the liquid causes a partial vacuum in the tank thesuction of the air into the device through the screen 11 and the chamberformed by the members 9 and 10 (more plainly shown in Figure 1) willcause the lifting or tilting' of the vacuum valve composed of themembers 44,

45, 46, 47, 48, 49, 50, :and 51 and cause the air to be drawn throu hthe aperture occasioned by the lifting or. ilting as shown 'by thearrows 59 and 60. As soon as sufiifurther ingress of the air to thetank.

From the description of the accompanying drawing and specification theadvantages of making, constructing, operating and applying the devicewill be apparent to those skilled in the art to which my inventionpertains; but it will be -understood that any modifications within thescope of the claimed invention may be made in the construction andcombination f parts without departing from the prinicpile of theinvention or sacrificing any of 1 s advantages.

Having thus described th invention what is claimed, and desired tobesecured by Letters Patent is: .f

1. A pressure and vacuum valve comprising a casing including pressureand overflow chambers, the latter having a screened outlet communicatingwith the atmosphere, said casing having an intermediate wall, acylindrical member mounted in said wall and provided with a valve seat,a pressure valve cooperating with said seat adapted to open due toincreased pressure of gases in the pressure chamber, 'and means forcarrying off the overflow.

2. A pressure and vacuum valve comprising a casing including pressureand overiow chambers, the latter having a screened outlet communicatingwith the atmosphere, means including a pressure. valve and seatintermediate the two chambers, the pressure valve adapted to open uponincreased pressure `of gases ascending into the pressure chamber, meansfor carrying off the overflow, means including a vacuum valve and seatand an air supply to the pressure chamber, whereby air may be drawn intothe pressure chamber to overcome a vaccum therein. v

' 3. A pressure and vacuum valve compris ing a` casing. includingpressure and overflow chambers, the latter having an outletcommunicating with the atmosphere, means communicatingly connecting thetwo chambers including a valve seat and a pressure valve, the valveadapted to open upon an increase of gases in the. pressure chamber,means to carry off the overflow, an air chamber within the pressurechamber and having a screened openingfor permitting,I air to enter theair chamber, means incluiing a valve seat and a vacuum valve cooperatingwith the seatfor controlling coinmunication between the air chamber andthe pressure chamber, allowing air to enter the pressure chamber when avacuum is created therein.

4. A pressure and vacuum valve comprising a casing including pressureand oveiflow chambers, the latter having an outlet communicating withthe atmosphere, means communicatingly connecting the two chambersincluding a valve seat and a pressure valve, the valve adapted to openupon an increase of gases in the lpressure chamber, means to carry offthe overflow, an air ehanienter the air chamber, means including a valveseat and a vacuum valve cooperating with the seat for controllingcommunication between the air chamber and the pressure chamber, allowingair to enter the pressure chamber when a vacuum is (f1-euml therein, andmeans depending from the intermediate portion of the casing for guidingthe vaeuuunvalve in raising and reseating itself.

ROBERT J. BIC/AUSLAND.

